Kailroad-car beake



3 Sheets-Shea? S. GUMAER.

Car Brake.

Patented Jan 26, 1858,

AM.PHDTO-LITHO. CO. NX (OSBDRNE'S PRdRESS 3 SheetsSheet 2.

S. GUMAER.

Car Brake.

Patented Jan. 26, 1858.

3 Sheet$-Sheet. 3.

s. GUMAE R.

Car Brake.

No. 19,192. Patented Jan. 26. 1858.

AM. PHOTO-THO. C0- N.Y-(0SBRNE'S PROCESS.)

UNITED STATES PATENT OFFICE.

SAMUEL GUMAER, OF CHICAGO, ILLINOIS.

RAILROAD-CAR BRAKE.

Specification of Letters Patent No.

To all whom it may concern Be it known that I, SAMUEL GUMAER, ofChicago, in the county of Cook and State of Illinois, have invented anew and useful Improvement in Railroad-Car Brakes; and I do herebydeclare that the following is a full, clear, and exact description ofthe construction and operation of the same, reference being had to theannexed drawing, forming part of this specification, in which- Figure 1is a side elevation of a car truck with my improved brake attached; andFig. 2 is a vertical longitudinal section of the same.

Similar characters of reference in the several figures denote the samepart.

The object of my invention is to check the rotation .of the wheelswithout stopping them, and arrest the motion of the car by the frictionof a shoe forced upon the rail,

my invention consisting in the peculiar combination of deviceshereinafter to be set forth for effecting the operation continuously.

In the drawing F is the truck frame, A A the axles and W WV the wheels,all of ordinary construction.

R R are the rubbers and S is the shoe jointed therewith at a a. Thisshoe has a standard I) running upward through the shaft 0. A spring [Zincloses this standard, and being attached to both shoe and shaft drawsthe shoe upward when pressure is removed from it. There are also springse 6 connecting the rubbers R R with the hangers h of the shaft 0.

Upon the shaft r;- is a tri-branched cam C operated by lever Z or in anysuitable manner, to first force the rubbers R R against the wheels, andthen press the shoe S down upon the rail. There is a flat spring finside the shoe upon which the toe of the cam acts in forcing down theshoe. This gives the necessary degree of elasticity to the shoe, andrenders it capable of rising over any inequality of the road, orobstruction on the rail, in the same manner as the springs of the cargive an elastic bearing of the wheels upon the rail. This elasticity isof the utmost importance in braking with a shoe upon the rail, as rigidpressure upon the rail is productive of injury to the entire 19,192,dated January 26, 1858.

mechanism, and has been a great objection to this mode of arresting themotion of cars. On removing the pressure of the cam, the springs d and elift the rubbers and shoes, the standard b serving as a guide.

The rubber may be applied outside of the wheel, as shown at X in thedrawing, if desired. And if necessary the rubbers may be applied abovethe axes of the wheels, these modifications requiring nothing butsuitable changes of levers and rods.

The branches of the cams are so constructed that branches m and a shallengage and force the rubbers against the wheels, before branch p actsupon the shoe.

By this construct-ion the velocity of rotation of the wheels is firstdiminished by the rubbers, and then the car is stopped by the pressureof the shoe on the rail. This progressive application of rubbers andshoe I deem important, and consider it as efiecting a better result thaneither a simultaneous pressure on wheels and rail, or a pressure uponthe rail previous to acting upon the wheels. For the simple reason thatpressure upon the rail when the train is in rapid motion is liable tothrow a car from the track. The system I propose reduces the velocity ofthe car and then applies the arresting force to the rail, thus causingthe stopping of the train without a sudden stoppage of the rotation ofthe wheels, or a dangerous pressure of the shoe upon the rail. In theseimportant features of rendering the pressure on the rail elastic, and inregulatin the time of pressure .on the rail, I consi er my constructiondifferent from all others for the same purpose.

I disclaim all combinations of shoes and rubbers for braking upon bothrail and wheels, when such combinations are designed, and arranged toact, either simultaneously, or first upon the rail. I also disclaim allshoes acting rigidly upon the rail, as forming no part of my invention.I further disclaim the use of cams in applying brake rubbers.

What I do claim as new and of my own invention and desire to secure byLetters.

Patent, is

The loosely hung rubbers and spring bottomed shoe connected as describedin combination with the tri-branched cam, when the lower toe of the camacts upon the signed my name before two subscribing Witspring, and thesaid parts are all relatively nesses.

the Wheels prior to the application of the 5 shoe to the rail,substantially as and for the purposes hereinbefore set forth.

arranged that the rubbers are applied to SAM'L GUMAER Witnesses:

GEO. PATTEN, JOHN S. HOLLINGSHEAD.

In testimony whereof, I have hereunto

